Regarding Tax payment

Recently i have changed my employer in the month of February. So while filing the tax returns using the 2 Form 16's(1 from old employer till Jan and another from new employer for 2 months Feb and March) i am in tax debt to the government.

In order to pay this amount to IT department i think i need to make online payment using challan. Does any one know which challan number i need to make payment against in this scenario. There are 4 different challans available to pay.